Circle of Confinement

When this enchantment enters, exile target creature an opponent controls with mana value 3 or less until this enchantment leaves the battlefield.
Whenever an opponent casts a Vampire spell with the same name as a card exiled with this enchantment, you gain 2 life.

Innistrad: Double Feature

Innistrad: Crimson Vow

Auras attached to the exiled creature will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled permanent will cease to exist. When the card returns to the battlefield, it will be a new object with no connection to the card that was exiled.

If Circle of Confinement leaves the battlefield before its enters-the-battlefield ability resolves, the target creature won't be exiled.

If a token is exiled this way, it will cease to exist and won't return to the battlefield.